diff options
Diffstat (limited to 'arch/ppc/lib/kgdb.c')
| -rw-r--r-- | arch/ppc/lib/kgdb.c | 321 |
1 files changed, 0 insertions, 321 deletions
diff --git a/arch/ppc/lib/kgdb.c b/arch/ppc/lib/kgdb.c deleted file mode 100644 index d3eb1f3..0000000 --- a/arch/ppc/lib/kgdb.c +++ /dev/null @@ -1,321 +0,0 @@ -#include <common.h> -#include <command.h> -#include <kgdb.h> -#include <asm/signal.h> -#include <asm/processor.h> - -#define PC_REGNUM 64 -#define SP_REGNUM 1 - -void breakinst(void); - -int -kgdb_setjmp(long *buf) -{ - asm ("mflr 0; stw 0,0(%0);" - "stw 1,4(%0); stw 2,8(%0);" - "mfcr 0; stw 0,12(%0);" - "stmw 13,16(%0)" - : : "r" (buf)); - /* XXX should save fp regs as well */ - return 0; -} - -void -kgdb_longjmp(long *buf, int val) -{ - if (val == 0) - val = 1; - asm ("lmw 13,16(%0);" - "lwz 0,12(%0); mtcrf 0x38,0;" - "lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);" - "mtlr 0; mr 3,%1" - : : "r" (buf), "r" (val)); -} - -static inline unsigned long -get_msr(void) -{ - unsigned long msr; - asm volatile("mfmsr %0" : "=r" (msr):); - return msr; -} - -static inline void -set_msr(unsigned long msr) -{ - asm volatile("mtmsr %0" : : "r" (msr)); -} - -/* Convert the SPARC hardware trap type code to a unix signal number. */ -/* - * This table contains the mapping between PowerPC hardware trap types, and - * signals, which are primarily what GDB understands. - */ -static struct hard_trap_info -{ - unsigned int tt; /* Trap type code for powerpc */ - unsigned char signo; /* Signal that we map this trap into */ -} hard_trap_info[] = { - { 0x200, SIGSEGV }, /* machine check */ - { 0x300, SIGSEGV }, /* address error (store) */ - { 0x400, SIGBUS }, /* instruction bus error */ - { 0x500, SIGINT }, /* interrupt */ - { 0x600, SIGBUS }, /* alingment */ - { 0x700, SIGTRAP }, /* breakpoint trap */ - { 0x800, SIGFPE }, /* fpu unavail */ - { 0x900, SIGALRM }, /* decrementer */ - { 0xa00, SIGILL }, /* reserved */ - { 0xb00, SIGILL }, /* reserved */ - { 0xc00, SIGCHLD }, /* syscall */ - { 0xd00, SIGTRAP }, /* single-step/watch */ - { 0xe00, SIGFPE }, /* fp assist */ - { 0, 0} /* Must be last */ -}; - -static int -computeSignal(unsigned int tt) -{ - struct hard_trap_info *ht; - - for (ht = hard_trap_info; ht->tt && ht->signo; ht++) - if (ht->tt == tt) - return ht->signo; - - return SIGHUP; /* default for things we don't know about */ -} - -void -kgdb_enter(struct pt_regs *regs, kgdb_data *kdp) -{ - unsigned long msr; - - kdp->private[0] = msr = get_msr(); - set_msr(msr & ~MSR_EE); /* disable interrupts */ - - if (regs->nip == (unsigned long)breakinst) { - /* Skip over breakpoint trap insn */ - regs->nip += 4; - } - regs->msr &= ~MSR_SE; - - /* reply to host that an exception has occurred */ - kdp->sigval = computeSignal(regs->trap); - - kdp->nregs = 2; - - kdp->regs[0].num = PC_REGNUM; - kdp->regs[0].val = regs->nip; - - kdp->regs[1].num = SP_REGNUM; - kdp->regs[1].val = regs->gpr[SP_REGNUM]; -} - -void -kgdb_exit(struct pt_regs *regs, kgdb_data *kdp) -{ - unsigned long msr = kdp->private[0]; - - if (kdp->extype & KGDBEXIT_WITHADDR) - regs->nip = kdp->exaddr; - - switch (kdp->extype & KGDBEXIT_TYPEMASK) { - - case KGDBEXIT_KILL: - case KGDBEXIT_CONTINUE: - set_msr(msr); - break; - - case KGDBEXIT_SINGLE: - regs->msr |= MSR_SE; -#if 0 - set_msr(msr | MSR_SE); -#endif - break; - } -} - -int -kgdb_trap(struct pt_regs *regs) -{ - return (regs->trap); -} - -/* return the value of the CPU registers. - * some of them are non-PowerPC names :( - * they are stored in gdb like: - * struct { - * u32 gpr[32]; - * f64 fpr[32]; - * u32 pc, ps, cnd, lr; (ps=msr) - * u32 cnt, xer, mq; - * } - */ - -#define SPACE_REQUIRED ((32*4)+(32*8)+(6*4)) - -#ifdef CONFIG_8260 -/* store floating double indexed */ -#define STFDI(n,p) __asm__ __volatile__ ("stfd " #n ",%0" : "=o"(p[2*n])) -/* store floating double multiple */ -#define STFDM(p) { STFDI( 0,p); STFDI( 1,p); STFDI( 2,p); STFDI( 3,p); \ - STFDI( 4,p); STFDI( 5,p); STFDI( 6,p); STFDI( 7,p); \ - STFDI( 8,p); STFDI( 9,p); STFDI(10,p); STFDI(11,p); \ - STFDI(12,p); STFDI(13,p); STFDI(14,p); STFDI(15,p); \ - STFDI(16,p); STFDI(17,p); STFDI(18,p); STFDI(19,p); \ - STFDI(20,p); STFDI(21,p); STFDI(22,p); STFDI(23,p); \ - STFDI(24,p); STFDI(25,p); STFDI(26,p); STFDI(27,p); \ - STFDI(28,p); STFDI(29,p); STFDI(30,p); STFDI(31,p); } -#endif - -int -kgdb_getregs(struct pt_regs *regs, char *buf, int max) -{ - int i; - unsigned long *ptr = (unsigned long *)buf; - - if (max < SPACE_REQUIRED) - kgdb_error(KGDBERR_NOSPACE); - - if ((unsigned long)ptr & 3) - kgdb_error(KGDBERR_ALIGNFAULT); - - /* General Purpose Regs */ - for (i = 0; i < 32; i++) - *ptr++ = regs->gpr[i]; - - /* Floating Point Regs */ -#ifdef CONFIG_8260 - STFDM(ptr); - ptr += 32*2; -#else - for (i = 0; i < 32; i++) { - *ptr++ = 0; - *ptr++ = 0; - } -#endif - - /* pc, msr, cr, lr, ctr, xer, (mq is unused) */ - *ptr++ = regs->nip; - *ptr++ = regs->msr; - *ptr++ = regs->ccr; - *ptr++ = regs->link; - *ptr++ = regs->ctr; - *ptr++ = regs->xer; - - return (SPACE_REQUIRED); -} - -/* set the value of the CPU registers */ - -#ifdef CONFIG_8260 -/* load floating double */ -#define LFD(n,v) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"(v)) -/* load floating double indexed */ -#define LFDI(n,p) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"((p)[2*n])) -/* load floating double multiple */ -#define LFDM(p) { LFDI( 0,p); LFDI( 1,p); LFDI( 2,p); LFDI( 3,p); \ - LFDI( 4,p); LFDI( 5,p); LFDI( 6,p); LFDI( 7,p); \ - LFDI( 8,p); LFDI( 9,p); LFDI(10,p); LFDI(11,p); \ - LFDI(12,p); LFDI(13,p); LFDI(14,p); LFDI(15,p); \ - LFDI(16,p); LFDI(17,p); LFDI(18,p); LFDI(19,p); \ - LFDI(20,p); LFDI(21,p); LFDI(22,p); LFDI(23,p); \ - LFDI(24,p); LFDI(25,p); LFDI(26,p); LFDI(27,p); \ - LFDI(28,p); LFDI(29,p); LFDI(30,p); LFDI(31,p); } -#endif - -void -kgdb_putreg(struct pt_regs *regs, int regno, char *buf, int length) -{ - unsigned long *ptr = (unsigned long *)buf; - - if (regno < 0 || regno >= 70) - kgdb_error(KGDBERR_BADPARAMS); - else if (regno >= 32 && regno < 64) { - if (length < 8) - kgdb_error(KGDBERR_NOSPACE); - } - else { - if (length < 4) - kgdb_error(KGDBERR_NOSPACE); - } - - if ((unsigned long)ptr & 3) - kgdb_error(KGDBERR_ALIGNFAULT); - - if (regno >= 0 && regno < 32) - regs->gpr[regno] = *ptr; - else switch (regno) { - -#ifdef CONFIG_8260 -#define caseF(n) \ - case (n) + 32: LFD(n, *ptr); break; - -caseF( 0) caseF( 1) caseF( 2) caseF( 3) caseF( 4) caseF( 5) caseF( 6) caseF( 7) -caseF( 8) caseF( 9) caseF(10) caseF(11) caseF(12) caseF(13) caseF(14) caseF(15) -caseF(16) caseF(17) caseF(18) caseF(19) caseF(20) caseF(21) caseF(22) caseF(23) -caseF(24) caseF(25) caseF(26) caseF(27) caseF(28) caseF(29) caseF(30) caseF(31) - -#undef caseF -#endif - - case 64: regs->nip = *ptr; break; - case 65: regs->msr = *ptr; break; - case 66: regs->ccr = *ptr; break; - case 67: regs->link = *ptr; break; - case 68: regs->ctr = *ptr; break; - case 69: regs->ctr = *ptr; break; - - default: - kgdb_error(KGDBERR_BADPARAMS); - } -} - -void -kgdb_putregs(struct pt_regs *regs, char *buf, int length) -{ - int i; - unsigned long *ptr = (unsigned long *)buf; - - if (length < SPACE_REQUIRED) - kgdb_error(KGDBERR_NOSPACE); - - if ((unsigned long)ptr & 3) - kgdb_error(KGDBERR_ALIGNFAULT); - - /* - * If the stack pointer has moved, you should pray. - * (cause only god can help you). - */ - - /* General Purpose Regs */ - for (i = 0; i < 32; i++) - regs->gpr[i] = *ptr++; - - /* Floating Point Regs */ -#ifdef CONFIG_8260 - LFDM(ptr); -#endif - ptr += 32*2; - - /* pc, msr, cr, lr, ctr, xer, (mq is unused) */ - regs->nip = *ptr++; - regs->msr = *ptr++; - regs->ccr = *ptr++; - regs->link = *ptr++; - regs->ctr = *ptr++; - regs->xer = *ptr++; -} - -/* This function will generate a breakpoint exception. It is used at the - beginning of a program to sync up with a debugger and can be used - otherwise as a quick means to stop program execution and "break" into - the debugger. */ - -void -kgdb_breakpoint(int argc, char *argv[]) -{ - asm(" .globl breakinst\n\ - breakinst: .long 0x7d821008\n\ - "); -} |